[clang] [clang][modules] Cache failed stats of additional module maps (PR #215964)

[Jan Svoboda via cfe-commits]

https://github.com/jansvoboda11 created https://github.com/llvm/llvm-project/pull/215964

The additional module maps stored in PCMs are just regular input files that are not expected to change during compilation. There's no reason to disable failure caching in the `FileManager` for them.

>From a12737daf8c65c1450490f77c26b0f8429434129 Mon Sep 17 00:00:00 2001
From: Jan Svoboda <jan_svoboda at apple.com>
Date: Thu, 13 Aug 2026 08:27:56 +0200
Subject: [PATCH] [clang][modules] Cache failed stats of additional module maps

The additional module maps stored in PCMs are just regular input files that are not expected to change during compilation. There's no reason to disable failure caching in the `FileManager`.
---
 clang/lib/Serialization/ASTReader.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/clang/lib/Serialization/ASTReader.cpp b/clang/lib/Serialization/ASTReader.cpp
index 0cb44da23d855..bd01861a8c609 100644
--- a/clang/lib/Serialization/ASTReader.cpp
+++ b/clang/lib/Serialization/ASTReader.cpp
@@ -4794,7 +4794,7 @@ ASTReader::ReadModuleMapFileBlock(RecordData &Record, ModuleFile &F,
     for (unsigned I = 0, N = Record[Idx++]; I < N; ++I) {
       // FIXME: we should use input files rather than storing names.
       std::string Filename = ReadPath(F, Record, Idx);
-      auto SF = FileMgr.getOptionalFileRef(Filename, false, false);
+      auto SF = FileMgr.getOptionalFileRef(Filename);
       if (!SF) {
         if (!canRecoverFromOutOfDate(F.FileName, ClientLoadCapabilities))
           Error("could not find file '" + Filename +"' referenced by AST file");